CVE-2025-22004 (GCVE-0-2025-22004)
Vulnerability from cvelistv5
Published
2025-04-03 07:19
Modified
2026-08-05 11:55
Summary
In the Linux kernel, the following vulnerability has been resolved: net: atm: fix use after free in lec_send() The ->send() operation frees skb so save the length before calling ->send() to avoid a use after free.
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: atm: fix use after free in lec_send()\n\nThe -\u003esend() operation frees skb so save the length before calling\n-\u003esend() to avoid a use after free."
        }
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              "value": "AV:N - The vulnerable code is the TX path of the `lec%d` netdevice, and an unauthenticated remote host reaches it with no local access \u2014 a packet sent to the LANE-attached host elicits a reply transmitted through `lec_start_xmit()` \u2192 `lec_send()`, and in the proxy/bridge mode LANE explicitly supports, a frame received on an Ethernet segment is forwarded straight out the ELAN into the same path. No adjacency is required since a LANE client is an ordinary routed IP host.\nAC:L - The read-after-free is unconditional on every successful send, with no race and no memory-layout precondition: `adummy_send()` and `atmtcp_v_send()` free the skb synchronously and return 0, after which `lec_send()` always dereferences `skb-\u003elen`. Even against hardware ATM drivers that free asynchronously via `vcc-\u003epop()`, the attacker simply drives traffic to hit it repeatedly.\nPR:N - Triggering requires no credentials on the target \u2014 a remote peer merely causes a frame to be transmitted on the emulated LAN. The `capable(CAP_NET_ADMIN)` checks on `ATMLEC_CTRL`/`ATMLEC_DATA` gate only the administrative LANE setup, not the vulnerable transmit path, which is also open to any unprivileged local process via a plain `sendto()`.\nUI:N - No victim action is needed; the freed-object read happens automatically in the netdevice transmit path and in the `lec_arp_check_expire()` workqueue drain.\nS:U - The stale read and the corrupted statistics counter are entirely within the kernel\u0027s own security authority, with no crossing into a hypervisor, IOMMU, or sandbox boundary.\nC:L - The stale `skb-\u003elen` from the freed skbuff is accumulated into `dev-\u003estats.tx_bytes`, which any user can read via `/sys/class/net/lec0/statistics/tx_bytes` or `/proc/net/dev`, yielding a repeatable kernel-heap disclosure \u2014 but it is strictly bounded to 4 bytes from one fixed offset of a `SLAB_NO_MERGE` cache, so it is a limited leak rather than an arbitrary read.\nI:L - Nothing is written into the freed object, so there is no memory corruption or write primitive; the only integrity effect is that attacker-influenced garbage is folded into the interface\u0027s `tx_bytes` counter, falsifying kernel-reported accounting data.\nA:H - This is a genuine use-after-free, and on KASAN- or KFENCE-instrumented kernels the access raises a slab-use-after-free report that panics the machine outright under `panic_on_warn`, which is common in production and CI fleets."
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      "title": "net: atm: fix use after free in lec_send()",
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    "cveId": "CVE-2025-22004",
    "datePublished": "2025-04-03T07:19:06.022Z",
    "dateReserved": "2024-12-29T08:45:45.802Z",
    "dateUpdated": "2026-08-05T11:55:57.189Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
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No adjacency is required since a LANE client is an ordinary routed IP host.\\nAC:L - The read-after-free is unconditional on every successful send, with no race and no memory-layout precondition: `adummy_send()` and `atmtcp_v_send()` free the skb synchronously and return 0, after which `lec_send()` always dereferences `skb-\u003elen`. Even against hardware ATM drivers that free asynchronously via `vcc-\u003epop()`, the attacker simply drives traffic to hit it repeatedly.\\nPR:N - Triggering requires no credentials on the target \\u2014 a remote peer merely causes a frame to be transmitted on the emulated LAN. 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\"versionType\": \"git\"}], \"programFiles\": [\"net/atm/lec.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.4.292\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.236\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.180\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.132\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.85\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.13.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.13.*\"}, {\"status\": \"unaffected\", \"version\": \"6.14\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/atm/lec.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/50e288097c2c6e5f374ae079394436fc29d1e88e\"}, {\"url\": \"https://git.kernel.org/stable/c/8cd90c7db08f32829bfa1b5b2b11fbc542afbab7\"}, {\"url\": \"https://git.kernel.org/stable/c/82d9084a97892de1ee4881eb5c17911fcd9be6f6\"}, {\"url\": \"https://git.kernel.org/stable/c/51e8be9578a2e74f9983d8fd8de8cafed191f30c\"}, {\"url\": \"https://git.kernel.org/stable/c/9566f6ee13b17a15d0a47667ad1b1893c539f730\"}, {\"url\": \"https://git.kernel.org/stable/c/326223182e4703cde99fdbd36d07d0b3de9980fb\"}, {\"url\": \"https://git.kernel.org/stable/c/f3271f7548385e0096739965961c7cbf7e6b4762\"}, {\"url\": \"https://git.kernel.org/stable/c/f3009d0d6ab78053117f8857b921a8237f4d17b3\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: atm: fix use after free in lec_send()\\n\\nThe -\u003esend() operation frees skb so save the length before calling\\n-\u003esend() to avoid a use after free.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.292\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.236\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.180\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.132\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.85\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.21\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.9\", \"versionStartIncluding\": \"2.6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14\", \"versionStartIncluding\": \"2.6.12\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T11:55:57.189Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2025-22004\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:55:57.189Z\", \"dateReserved\": \"2024-12-29T08:45:45.802Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-04-03T07:19:06.022Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.


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